Tuesday in parliament, 374 out of 430 lawmakers approved Medvedev for the post in which he has served.
Vladimir Putin has taken the oath of office for his fourth term as Russian president, in a ceremony in an ornate Kremlin hall glimmering with gold leaf.
Later on, Medvedev became Prime Minister of the Russian Federation, when Vladimir Putin was elected the Russian president, on May 8, 2012.
The three leaders previously attended the Victory Day military parade in the Russian capital, organized every year on May 9 to mark victory over fascism in the Second World War.
Russian President Vladimir Putin has commended the government led by Dmitry Medvedev, which stepped down on May 7, for good work in a hard period without seeking short-term political effects, TASS reports.
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When they arrived, several workers of different parties were already at the spot. He also said that he did not know why Prakash Javadekar lied about this fact.
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Tory former minister Dominic Grieve said it was "regrettable" and "undesirable" that Mr Johnson had chose to sound off in public. The system would not help the United Kingdom take back control of our trade policies, laws, borders or our money, he added.
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"I consider it quite logical that this team will have to implement these plans", Putin said.
According to the Russian legislation, Medvedev has to present a Cabinet lineup within a week.
The plan calls for heightened efforts to diversify Russia's economy, which is now heavily dependent on oil and gas exports, by strengthening the technology sector and boosting agricultural exports.
Infrastructure projects are a major part of the roadmap laid out by the four-term president who was sworn in on Monday.